Re: identical G05-802 problem with 2 different deflection PCBs

I'll give it a go. I did clean the fuse block and replace the fuses
back in the beginning but didn't touch the molex connectors. I
measured a steady 6.3 but never looked at it over time either.

Last night I reflowed a few connections just in case, but had no luck.

On the other hand, the problem may be linked to heat somewhere. If I
leave the game off for a while, it takes longer to to reach the
visible retrace lines point than if I power it back on shortly after a
previous session.

I measured the HV and it starts at 12.64 (which seems a bit high) and
slowly creeps up to 12.73 when the retrace lines show up. It may go
higher but I don't want to damage the tube so I power down at that
point. Not sure if such a change can be considered within acceptable
limits or not.

Colin

On 06 Dec 2009, at 21:53, Matt J. McCullar wrote:

> It's a long shot, but try checking/cleaning the fuse blocks as well
> as all
> the in-line Molex connectors. I once had an _Asteroids_ cabinet
> that had a
> flaky fuse in the 6.3 VAC secondary of the power transformer; it lit
> up the
> lights in the coin door, but it also went to the heater in the
> picture tube.
> The fuse itself was weak and had enough of a voltage drop that the
> picture
> tube wouldn't light up. Replacing that fuse fixed the whole thing
> but it
> took me a while to find.
>
> Matt J. McCullar
> Fort Worth, TX
> ***************************
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org]On Behalf Of Colin O'Brien
> Sent: Saturday, December 05, 2009 5:54 PM
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: identical G05-802 problem with 2 different
> deflection PCBs
>
>
>
> So, I finally got through the whole cab checking for shorts and didn't
> find anything suspicious as far as I could see.
>
> This is where it gets interesting, after plugging everything back in,
> I no longer have the spot killer on and I get a picture on the screen.
> So, I'm guessing I "fixed" a bad connection this way. Which also means
> it might re-appear.
>
> However, if I leave it on for a minute or so, the brightness starts
> varying/pulsing and the center beam dot appears along with the
> increase, this gradually and randomly increases until I get retrace
> lines which finally stay on. The contrast and brightness pots have
> less and less effect until it reaches full strength and they have no
> effect at all. This happens with the 2 different deflection PCBs and
> the spot killer never turns on.
>
> I measured voltage at Z on P100 over a few minutes but saw no gradual
> increase.
>
> Any idea on my new problem? :)
>
> Thanks again,
> Colin
>
>
>
>
>
>
>
> On 01 Dec 2009, at 09:46, Colin O'Brien wrote:
>
>>
>> Yes, all checked and at the right places (several times even, as
>> powering up blows them :) ).
>>
>> Last night, I started going through everything looking for dead
>> shorts, no luck at the moment but there's a lot left. After taking
>> the power brick out to check below the case, I did notice the
>> transformer is a replacement and has been spliced in. Initial
>> comparison with the wiring diagrams seem to indicate it's all done
>> correctly but I'm going to give it a lengthier check tonight.
>>
>> Colin
>>
>>
>>
>> On 01 Dec 2009, at 02:12, teeray wrote:
>>
>>> Check for wrong Transistors or transistors in the wrong socket.
>>>
>>> Did you check to make sure
>>> Q708 = 2N3716 - NPN
>>> Q709 = 2N3792 - PNP
>>> Don't forget to check for collector-->emitter shorts
>>>
>>> Also check R720 and R721
>>>
>>> Tim
>>>
>>> -----Original Message-----
>>>> From: Colin O'Brien <colin@onepointzero.com>
>>>> Sent: Nov 30, 2009 2:28 PM
>>>> To: vectorlist@vectorlist.org
>>>> Subject: Re: VECTOR: identical G05-802 problem with 2 different
>>>> deflection PCBs
>>>>
>>>>
>>>> Yes, I checked the chassis. Even at multiple stages, with and
>>>> without
>>>> the screws etc.
>>>>
>>>> Colin
>>>>
>>>>
>>>>
>>>> On 30 Nov 2009, at 14:09, COLIN DAVIES wrote:
>>>>
>>>>> I know you said you checked for shorts on the looms.... but I saw
>>>>> no
>>>>> mention of the chassis... So....
>>>>> Are any of the Chassis Transistors (body or leads) shorted to the
>>>>> chassis iself ?... ( The Screws should be insulated and you need
>>>>> to
>>>>> use a mica insualtor if it were misssing... That would be sure to
>>>>> cause trouble....
>>>>>
>>>>> Regards, Colin Davies
>>>>>
>>>>>
>>>>> --- On Mon, 30/11/09, Colin O'Brien <colin@onepointzero.com>
>>>>> wrote:
>>>>>
>>>>> From: Colin O'Brien <colin@onepointzero.com>
>>>>> Subject: Re: VECTOR: identical G05-802 problem with 2 different
>>>>> deflection PCBs
>>>>> To: vectorlist@vectorlist.org
>>>>> Date: Monday, 30 November, 2009, 11:42
>>>>>
>>>>>
>>>>> I did in the beginning, but since then I've only re-metered the
>>>>> sections that connect directly to the deflection PCB side without
>>>>> finding anything.
>>>>> I'll give it another thorough going through just to be sure.
>>>>>
>>>>> Colin
>>>>>
>>>>>
>>>>>
>>>>> On 30 Nov 2009, at 11:06, Pinx wrote:
>>>>>
>>>>>> Have you meter'd all your looms for dead shorts ?
>>>>>>
>>>>>> Pinx
>>>>>> ----- Original Message ----- From: "Colin O'Brien"
> <colin@onepointzero.com
>>>>>>
>>>>>> To: <vectorlist@vectorlist.org>
>>>>>> Sent: Sunday, November 29, 2009 11:18 PM
>>>>>> Subject: VECTOR: identical G05-802 problem with 2 different
>>>>> deflection PCBs
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> I've been a lurker here for a while, quietly absorbing the
>>>>> insight but I've hit a problem that has me (and my limited
>>>>> knowledge) baffled.
>>>>>>>
>>>>>>> I have a working asteroids game board (2 actually), with which I
>>>>> can play fine on the scope (also when grabbing the signal from
>>>>> P100 instead of the test points)
>>>>>>>
>>>>>>> When I initially got the machine, I had problems with the
>>>>>>> monitor
>>>>> (G05-802) having no horizontal deflection and the spot killer
>>>>> being
>>>>> active. After checking the PCB, I replaced a couple of transistors
>>>>> on the board a well as the Q708 & 709 chassis transistors.
>>>>>>>
>>>>>>> Upon powering up, I would lose the 2 chassis transistors in
>>>>> question and sometimes the F700 fuse. I practically inspected
>>>>> every
>>>>> single component on the board, but found no extra faults. I
>>>>> looked
>>>>> for shorts, tested voltages (95V at P500, 30-35 VAC coming in at
>>>>> P100 pins 7 & 10, 12kV for HV etc) but found nothing that looked
>>>>> suspicious to me.
>>>>>>>
>>>>>>> I recently got a new known working/tested deflection PCB as a
>>>>> comparison/reference point, hoping that would help me see what was
>>>>> wrong or, at the worst, serve as a working board. Well, no luck
>>>>> there, when I plugged it in the spot killer was on and I had no
>>>>> horizontal deflection. I guess I can deduce from this that my
>>>>> problem is outside the PCB itself?
>>>>>>>
>>>>>>> Powering it up a second time to take some readings, the spot
>>>>> killer was still on but I'd lost the picture, turning brightness/
>>>>> contrast up only produced a faint haze towards the top of the
>>>>> screen.
>>>>>>>
>>>>>>> Inspection of the PCB revealed R713 was burnt to a crisp as well
>>>>> as its neighbours Q705 and Q706 both being shorted. I checked the
>>>>> chassis transistors, they were fine, I looked for shorts in the
>>>>> sockets, plugs and cables leading to them but found nothing wrong
>>>>> either.
>>>>>>>
>>>>>>> I replaced the dead components but powering it up now blows F700
>>>>> when I'm lucky or the chassis transistors. I'm weary of powering
>>>>> it
>>>>> up again as I don't feel like destroying components for the fun
>>>>> of
>>>>> it.
>>>>>>>
>>>>>>> I'm at a loss now, not sure where to look outside the PCB. Could
>>>>> the yoke be at fault? I'm in unknown territory here and would
>>>>> appreciate any pointers I can get.
>>>>>>>
>>>>>>> Thanks!
>>>>>>> Colin
>>>>>>>
>>>>>>>
>>>>>>>
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>>>>
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Received on Mon Dec 7 12:49:50 2009